SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Chunjie Du,Yuehua Hu,Haisheng Han,Wei Sun,Panpan Hou,Runqing Liu,Li Wang,Yue Yang,Ruohua Liu,Lei Sun,Tong Yue
Traditional chemical precipitation of phosphates from wastewater is somewhat inefficient because it produces some ultrafine hydroxyapatite particles that are difficult to settle. In this study, magnetic seeds with a core–shell structure were prepared by sulfation roasting for magnetic flocculation of those fine particles. Zeta potential measurements show that the hydroxyapatite particles are positively charged at pH 10, whereas the magnetic seeds are negatively charged. The Derjaguin–Landau–Verwey–Overbeek calculation indicates that the van der Waals force between the magnetic seeds and hydroxyapatite particles is always attractive. Moreover, the electrostatic attraction also contributes to aggregation of the magnetic seeds and hydroxyapatite particles. Orthogonal experiments show that the main factor affecting the magnetic flocculation is the dosage of magnetic seeds, and polymeric ferric sulfate also plays an important role. Under the optimal magnetic flocculation experimental conditions, the turbidity of wastewater after magnetic separation was only 16.388 NTU, contributing to the removal of phosphate contaminants. Therefore, magnetic flocculation and magnetic separation may provide an alternative solution for efficient purification of phosphate-containing wastewater.
研究领域:
环境科学
·
水处理技术
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DOI
PubMed
高影响因子
POLYMER BULLETIN
·
2020
·Vol. 78
·期 5
·2483-2503
·
IF 2.014
Mao Hui,Wang Weiji,Ma Yongle,Huang Yan
An anionic polymer P (ANAN) of acrylamide, N -vinyl-2-pyrrolidone and 2-acrylamide-2-methylpropanesulfonic acid was synthesized through free radical polymerization and initiated by 2,2′-Azobis (2-methylpropionamide) dihydrochloride as an anti-high temperature and anti-calcium and magnesium contamination fluid loss control additive for water-based drilling fluid. The P (ANAN) was characterized by 13 C-NMR and 1 H-NMR, FTIR, elemental analysis and GPC analysis. The fluid loss tests were carried on different WBDFs. The results showed that this polymer can resist 4.5 × 10 5 ppm of Cl −1 , 4 × 10 5 ppm of Ca 2+ contamination at low pH environment caused by acid gas invasion in drilling fluid at 180 °C. The fluid loss control mechanisms of P (ANAN) were investigated by Zeta potential analysis, particle size distribution analysis and mud cake quality analysis. The thermal stability was investigated by TGA analysis. The results illustrate that the P (ANAN) exhibits a stronger interaction with clays and higher-temperature resistance, and it can improve the colloidal dispersion property obviously for drilling fluid under salts, calcium and magnesium contamination and even under circumstances of acid gas invasion conditions. Due to its superior fluid loss control properties, the P (ANAN) can be a promising polymer for water-based drilling fluid in deep and ultra-deep well drilling applications.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yuan Gao,Qimeng Sun,Yang Chen,Xinghai Zhou,Chunyan Wei,Lihua Lyu
Solar-driven evaporators offer a promising approach to obtaining fresh water due to their environmental protection and pollution-free operation, and because they require no other energy input. In this work, we prepared a low-cost fabric roll-based bionic evaporator (FRBE) with advanced heat management and salt pollution resistance based on a three-dimensional (3D) spiral groove structure design for the solar evaporation of seawater. The spiral groove structure, inspired by the vertical water supply of natural trees, had a super-strong regional water circulation ability between the yarns and fibers. The heat energy of the photothermal surface was quickly transmitted to the cold evaporation surface to realize rapid water evaporation, and the low evaporation surface temperature effectively reversed the usual heat loss phenomenon. Under 1.0 sun irradiation, the evaporation rate and evaporation efficiency of the prepared FRBE-4–2 reached 2.89 kg·m −2 ·h −1 and 130.04 %, respectively. In the evaporation tests with 10 wt% and 20 wt% NaCl solutions, the regional water circulation effectively promoted the dissolution and diffusion of salt on the evaporation surface, reflecting excellent salt pollution resistance performance. Therefore, the 3D spiral evaporation surface design developed in this study provided a new idea for efficient and sustainable steam generation.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Li Yang,Yu-Xi Feng,Yu-Juan Lin,Xiao-Zhang Yu
Various environmental contaminants can find their way to enter plant cells and disturb and/or damage the essential components of PSII repair cycle in chloroplast, thereby resulting in dysfunction of chloroplast. In the current research, a microcosm hydroponic experiment was set up to evaluate the comparative effects of sodium hydrosulfide (NaHS)- and proline (Pro)-mediated functional repairing of chloroplast in rice plants under SCN − stress. Our results displayed that when exposed to environmental realistic SCN − concentrations (24–300 mg L −1 ), foist significant ( p < 0.05) gene-dose repercussion on the pathways of photosynthetic reactions and energy metabolism in rice shoots, and a downturn in the level of total soluble starch, sugar, and chlorophyll. Sodium hydrosulfide application effectively mitigated ( p < 0.05) the toxic effects of SCN − in rice seedlings by stimulating the processes of phosphorylation, dephosphorylation and new-synthesis of D1 protein in the PSII repair cycle, and increased the turnover of D1 protein to recover CO 2 assimilation. Evidently, Pro treatment mainly enhanced ( p < 0.05) the expression of magnesium chelatase (MgCh) and ribulose-1,5-bisphosphate carboxylase (Rubisco) related genes under simulated SCN − stress, suggesting that the targeted repairing site in chloroplast by Pro was different from NaHS. The outcome of the present research contributes to a better understanding at molecular level for repairing of chloroplast functional disorder by NaHS and Pro at different key nodes under SCN − stress.
研究领域:
植物学
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环境科学
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分子生物学
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DOI
PubMed
高影响因子
Toxics
·
2024
·Vol. 12
·期 8
·591
·
IF 3.9
Peng Tian,Yu-Xi Feng,Yan-Hong Li
The presence of thiocyanate (SCN−) in irrigation water has adverse effects on both plant growth and crop output. Hydrogen sulfide (H2S) is an important gaseous signaling molecule that can alleviate SCN−stress. Flavonoids are secondary compounds produced by plants and are ubiquitous in the plant kingdom. They play important roles in several physiological and biochemical processes. To investigate the effect of exogenous H2S on the growth of early rice plants under SCN−stress, we carried out a hydroponic experiment focusing on the interaction of exogenous H2S with flavonoids. In this study, a hydroponic experiment was performed to investigate the behavior of SCN−when subjected to varying effective doses (EC20: 24.0 mg/L; EC50: 96.0 mg/L; and EC75: 300.0 mg/L). The findings indicated that the relative growth rate (RGR) of the plants treated with H2S + SCN−was greater than that of the plants treated with SCN−alone. Higher amounts of flavonoids were detected in the shoots than in the roots, with more variability in the shoots. The early warning level results showed that most of the flavonoids were present at levels I and II, while quercetin was present at level IV. Genetic expression variation factor (GEVF) analyses revealed an increase in the quantity of “promoter genes” with increasing SCN−concentration in both rice tissues. Furthermore, administering external H2S while exposing rice tissues to SCN−resulted in a considerable decrease in the levels of reactive oxygen species. This study provides novel insights into the regulation of flavonoid levels in rice plants by exogenous H2S, facilitating enhanced resistance to SCN−stress and promoting sustainable agriculture.
研究领域:
植物学
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环境科学
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分子生物学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Cuishuang Jiang,Mingyi Zhang,Guojun Dong,Tong Wei,Jing Feng,Yueming Ren,Tianzhu Luan
It is highly desirable but challenging to control nitrate contamination using photocatalytic reduction technology over non-mental catalysts. Herein, hexagonal boron nitride (h-BN), a typical non-metal catalyst, was employed to photocatalytic denitration in water with formic acid (FA) as a hole scavenger. Compared with a mental catalyst TiO 2 and a non-mental catalyst g-C 3 N 4 , h-BN obtained a more effective reduction performance with nitrate conversion of 97.16% and N 2 selectivity of 95.42%. After three cyclic use, it still presented excellent reduction activity and structure stability. In the h-BN system, the initial pH had a significant effect on the nitrate reduction performance because it determined the surface charge property of the catalyst or the dispersibility in water, and the presence of anions slightly decreased the nitrate conversion process since the competitive adsorption of NO 3 – or NO 2 – . Photocatalytic denitration over h-BN was well according with the Extended-Langmuir-Hinshelwood model. By comparing the average stoichiometric ratio of consumed FA and removed NO 3 – (i.e. experiment value) with the theoretical value, it was determined that there were additional electrons involved in the reduction reaction in addition to CO 2 •- radicals, which was also supported by the quenching experiments. Moreover, CO 2 •- radicals were mainly responsible for the conversion of NO 2 – to N 2 . Exposed B atoms on the h-BN edges behaved as the adsorption sites of nitrogen oxide anions. This study provides a proof-of-concept demonstration of non-mental photocatalyst h-BN for more effective management of nitrate contamination.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Benqiang Cen,Rui Yang,Kexun Li,Cuicui Lv,Bolong Liang
Nitrate pollution has become an increasingly serious water pollution problem worldwide. Capacitive deionization (CDI) technology is an emerging water treatment technology that can efficiently remove nitrate in water with advantages of simple process, high water recovery rate, low cost and energy consumption. In this work, we engineer a covalently bonded quaternized activated carbon (QRAC) material by silanization and investigate its selective adsorption of nitrate in mixed solution with extended voltage capacitive deionization (eV-CDI) mode. The results show that (1) the QRAC electrodes achieve selective adsorption due to the different adsorption binding energies of the quaternary ammonium group with Cl - and NO 3 – . The selectivity coefficient of QRAC-5 to NO 3 – reaches 2.7 at 0.4 V and the electrosorption capacity is 140% higher than that of AC in 5/5 mM KCl/KNO 3 solution. (2) The electrosorption of QRAC electrodes are dominated by two aspects: physical adsorption by external electric field which occurs in the incipient stage and ion exchange adsorption by quaternary ammonium groups occurring in the following stage. (3) CDI experiments in simulated municipal wastewater show that SO 4 2- had a negative effect on the adsorption capacity of NO 3 – , but QRAC electrode can still achieve separation effect in Cl - /NO 3 – solution system. These results show that covalently bonded quaternized activated carbon can achieve the effective separation and removal of NO 3 – in polluted water, and our work provides new insights into the selective electrosorption of CDI technology.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 39
·51001
·
IF 3.125
Guoshuai Wang,Guancheng Jiang,Jun Yang,Lili Yang,Xinliang Li,Yinbo He,Xiangyang Chang
Ultra-high temperature dramatically deteriorates rheological properties and filtration performance of water-based drilling fluids (WBDFs), especially for a salt-gypsum formation that greatly restricts the application of WBDFs in ultra-deep well drilling operations. Hence, the research in this article used an anionic copolymer (DANS) prepared by N , N -dimethylacrylamide, 2-acrylamide-2-methylpropanesulfonic acid, N -vinylpyrrolidone, and sodium 4-styrenesulfonate as an anti-ultra-high temperature and anti-salt contamination filtrate reducer. Due to its multiple bulky cyclic structures in the side chain, DANS exhibits excellent thermal stability in the thermal gravimetric, rheological, and filtration tests. By adding 1.0 wt% DANS, the American Petroleum Institute (API) filtration volume of sodium bentonite-based fluids (SBT-BFs) decreased from 56.0 to 9.2 ml after aging at 240°C. Even under both 20 wt% NaCl contamination and 240°C aging, SBT-BFs with 2.0 wt% DANS could maintain a filtration volume of 9.4 ml, whereas SBT-BFs without DANS reached a filtration volume of 203.0 ml. The possible filtration control mechanism of DANS was further investigated via the Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), ζ potential, particle size distribution, filter cake micro-morphology, and transmission electron microscopy (TEM). Confirmed by FTIR and AFM results, the effective adsorption was formed between DANS and bentonite even under a high-salinity environment. Thus, a firm “dot net” structure formed by bentonite/DANS was observed by TEM, significantly improving the colloidal stability, dispersibility, and filter cake compactness of SBT-BFs. Finally, by utilizing DANS as the core treatment agent, a high-density WBDFs system with a temperature resistance of 240°C and a salt-tolerance of 20 wt% has been successfully prepared.
研究领域:
石油工程
·
材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Kaige Ren,Chao Li,Wuzhu Sun,Bingwei Zhong
Nitrate (NO 3 − ) contamination poses a critical global water security challenge, particularly in remote and off-grid regions where conventional centralized treatment infrastructure is economically impractical. Here, we report a solar-rechargeable zinc-nitrate (Zn-NO 3 − ) galvanic cell that transforms nitrate remediation from an energy-consuming process to a solar-rechargeable, self-powered system. The system works through a successive two-step process. First, a galvanic cell, comprising a Zn anode and an electrochemically reconstructed nanostructured silver (NS@Ag) cathode, spontaneously reduces nitrate (NO 3 − ) to nitrite (NO 2 − ). The first step needs no external power and achieves high nitrite selectivity (>98 %). Then, the generated NO 2 − reacts with sulfamic acid (HSA) to form benign nitrogen gas (N 2 ); this stoichiometric reaction ensures almost complete N 2 selectivity. A key point of our design is the integration of photovoltaics to regenerate the consumed Zn anode using solar energy, which creates a closed, self-sustaining loop. Further tests showed that the system remained stable over long-term cycling, with performance fully recovering after either electrical or solar recharging. By combining galvanic energy harvesting with solar regeneration, this integrated system offers a promising decentralized strategy for nitrate removal in off-grid or resource-poor regions.
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产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2025
·
IF 6
Fengjiao Quan,Pengfei Xu,Xiufan Liu,Wenjuan Shen,Yuhao Li,Jianfen Li,Yun He,Fangyuan Chen
Nitrate (NO 3 − ) pollution in groundwater has emerged as a pressing environmental issue of global concern. The excessive application of chemical fertilizers is widely recognized as the primary contributor to this pollution Nitrate ions pose significant risks to human health and the ecological environment. Electrochemical reduction of NO 3 − to NH 3 (NITRR) represents an effective approach for nitrogen recovery and recycling. Among many electrode materials, copper-based catalysts were considered promising due to their low cost and strong NO 3 − conversion capability. However, excessively strong adsorption can lead to catalyst deactivation, thereby diminishing catalytic activity. In this study, we developed an electrode material (Cu@NiO/NF) with low-valent copper (Cu δ+ ) through the combination of Cu and NiO, and it exhibited excellent catalytic performance in the NITRR process. At − 0.45 V vs. RHE, this catalyst achieved a Faraday efficiency of 95.7 % and an ammonia yield of 0.85 mg h −1 cm −2 . Further experiments and theoretical calculations demonstrate that the presence of NiO in Cu@NiO/NF stabilizes Cu δ+ , thereby enhancing the charge transfer rate and promoting the formation of hydrogen radicals (H•). This work has pioneered a new avenue for the development of efficient and innovative NTIRR materials.
研究领域:
环境科学
·
电化学
·
催化
·
材料科学
·
水污染控制
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zhiqin Deng,Chaoqun Ma,Zerong Li,Yongsong Luo,Longcheng Zhang,Shengjun Sun,Qian Liu,Juan Du,Qipeng Lu,Baozhan Zheng,Xuping Sun
Electrocatalytic nitrate reduction reaction (NO3RR) affords a bifunctional character in the carbon-free ammonia synthesis and remission of nitrate pollution in water. Here, we fabricated the Co3O4 nanosheet array with cobalt vacancies on carbon cloth (vCo-Co3O4/CC) by in situ etching aluminum-doped Co3O4/CC, which exhibits an excellent Faradaic efficiency of 97.2% and a large NH3 yield as high as 517.5 μmol h–1 cm–2, better than the pristine Co3O4/CC. Theoretical calculative results imply that the cobalt vacancies can tune the local electronic environment around Co sites of Co3O4, increasing the charge and reducing the electron cloud density of Co sites, which is thus conducive to adsorption of NO3– on Co sites for greatly enhanced nitrate reduction. Furthermore, the vCo-Co3O4 (311) facet presents excellent NO3RR activity with a low energy barrier of about 0.63 eV on a potential-determining step, which is much smaller than pristine Co3O4 (1.3 eV).
研究领域:
电化学
·
催化
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Wenjuan Wang,Yanfang Huang,Hongfei Ma,Lulu Kou,Bingbing Liu,Hu Sun,Shuzhen Yang,Guihong Han
Eutrophication of water bodies due to excessive phosphate release is becoming a serious issue. Herein, an Fe(III)-fulvic acid carrier with a synergistic effect with a surfactant was fabricated for the first time by a solvothermal method and evaluated for the removal of phosphate via an adsorption flotation strategy. This study indicated that the solvothermal method significantly improved the specific surface area, pore structure and active site distribution of the adsorption carrier and initially enhanced its adsorption performance. In addition, based on the synergistic effect of Fe(III)-fulvic acid and cetyltrimethylammonium bromide (CTAB), the competitive effect of surfactant and target ion in the adsorption flotation process was effectively broken. The theoretical maximum adsorption capacity of Fe(III)-fulvic acid increased from 169.205 ± 0.846 mg·g −1 to 274.725 ± 0.550 mg·g −1 after introducing CTAB, which was improved by 62.32% relative to the adsorption stage. FTIR and XPS analyses verified that the re-enhancement of the adsorption performance of the adsorbent carrier was mainly attributed to the chemisorption of CTAB with the carboxyl groups on the carrier surface, which intensified the electrostatic attraction and ligand exchange between the carrier and phosphate. Additionally, fractal and EDLVO theories revealed that CTAB could obviously improve the floatability of the carrier particles. Concurrently, the regeneration studies suggested that Fe(III)-fulvic acid possessed stable adsorption and flotation separation performance after three cycles. Overall, the Fe(III)-fulvic acid fabricated in this study not only realized the resource utilization of fulvic acid but also had practical application potential for the purification of oxyanions.
研究领域:
环境科学
·
水处理
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）